Thursday, March 28, 2024, 7:34 PM
Site: BUNN Learning Center
Course: BUNN Learning Center (BLC)
Glossary: BUNN Glossary

Static Water Pressure

Static pressure is the measurement of water that is not moving or flowing.

Switches

Switches are devices designed to allow current/voltage to pass or not to pass, depending on whether it is "open" or "closed". There are many different configurations available to satisfy many different applications. They are as simple as a single pole, single throw (wall switch), to the much more sophisticated "gauge" type switches that have multiple layers and can switch many components off or on at the same time. They come in many different packages as well. Membrane switches are common in touch pads, float switches are reed switches that are activated by magnets, and mechanical switches are sets of contacts.

Thermal Cutt-Off

Thermal cut off, or sometimes referred to as TCO, is a fuse that acts in the same way as a limit thermostat. If the temperature reaches a certain level the TCO fuse will blow just the same as any other fuse, cutting power to the tank heater. The TCO is also current sensitive.

Thermistor

A thermistor is a temperature sensitive resistor used to monitor temperatures. It changes value as it cools or heats. NTC (Negative Temperature Coefficient) thermistors will decrease in ohms value as it heats, and are commonly used in temperature sensing. PTC (Positive Temperature Coefficient) thermistors increase in ohms value and are generally used in protective circuits by monitoring over current conditions.

Thermoelectric Cooler (Peltier Device)

A thermoelectric cooler (TEC) is a small cooling device that relies on a Peltier junction. Composed of two conductors made of different materials, a Peltier junction acts as a heat pump which can cool or warm when current is passed through it. For example as current passes through one side is hot and the other is cold. This device is used to chill, (approximately 20º from ambient air temperature), but not refrigerate concentrate product.

ThermoFresh®

BUNN offers a full line of vacuum-insulated servers and brewers that brew directly into these servers that keep coffee at optimal flavor for hours and save on energy consumption and by not requiring warming plates.

Timer Board

The timer board is designed to provide the voltage to a specific device in order to energize it. It can energize a relay, inlet solenoid, pump, dump valve or other device for brewing or can energize a motor to grind coffee, to name a few.

Torque Sensing Board

The board consists of an inferred LED and a photo transistor which monitor the auger shaft and motor pin distance. The microprocessor will determine the shut off point of the refrigerant solenoid in relation to the thickness (distance) setting in the function menu.

Total Dissolved Solids (TDS)

Total dissolved solids, or TDS, is the total weight of the solids that are dissolved in the water, given in ppm per unit volume of water.

Transformer

A transformer is a device used to step a voltage up or down and isolate circuits. It consists of two sets of windings (lengths of coated wires), which have no electrical connection to each other. An AC voltage is applied to the primary winding, which generates a field of flux. This action causes the secondary of the transformer to generate a stepped-down AC voltage. In BUNN equipment, 12 volt and 24 volt step down transformers are most common.

Triac

A triac is a solid-state device that performs the same function as a relay, without the moving parts. Its construction is T-1 (terminal), T-2, and a gate. Normal state of a triac is “open” between T-1 and T-2. Applying a small AC voltage to the gate activates it, which then “shorts” or closes the two terminals and allows current to pass. Because there are no moving parts, a triac has no contacts and will not “pit” and wear out like a relay can.

Ultra Auger Motor

This motor is used to rotate the auger; mixing the product and shaving the ice off the cooling drum. The motor has a fixed RPM speed.

Universal Power Supply

The Universal Power Supply, (UPS), is used to convert variations of line voltage to 24 VDC. The power supply powers all internal components except for the tank heater, which operates on line voltage.

Venturi Assembly

The venturi assembly creates a siphon that pulls product through the valve, where water and concentrate are mixed during a dispense. The water under pressure flows through a narrow or restricted area, which increases the speed or velocity of the water in the valve. The increased speed of the water creates a low pressure at that point creating a suction or vacuum pulling the concentrate into the assembly where it is mixed with the water.

Wetting

Grounds begin to absorb hot water from the sprayhead and release gasses from the coffee. Part of the brewing process that includes Extraction and Hydrolysis.

Whipper Motor

A high speed motor used to rotate a frother blade to blend product (powder) and water during a beverage dispense.

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